Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3c2f8360737d81…

MALICIOUS

PDF

150.8 KB Created: 2021-06-12 16:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c47cf1c48333214f4df0f00cc61acb8e SHA-1: 058414157ae2df7de0871d133acf2135277e3601 SHA-256: 3a3c2f8360737d81283458cd2f38135572070fbb2ecd78bd594f7c4596eecd1d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to yoga asanas, likely to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/pbw?utm_term=yoga+asanas+chart+with+names+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403539/normal_60ba4a78b2ee4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5ff286bfa5796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6024000a79622.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451549/normal_6005a16f31393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_5fd9ff6a8a950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_6015883eaea20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_603ddebfb5239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_603a16a13c6a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_603620c951e3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_60664699e23cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462730/normal_60450b59085ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e341be60-08b0-4483-b8a2-fc009ddae45a/navy_advancement_results_fall_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2276f42e-0fa4-435d-af87-bbc903bdc4cd/western_union_money_transfer_from_philippines_to_singapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a6aaec-ce1d-47d6-b273-cdead9173649/71282161899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f76c76-416b-41b7-af6a-2a51639334f3/76721205187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05932fcc-60c7-4d76-b895-305a257a9529/the_body_book_cameron_diaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/805fbb24-bf2e-4289-8e38-46e9cf951664/gedigurik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4096847a-358e-4e5a-b64c-cd823023d8f9/how_to_connect_ihome_reflect_to_iphone.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/f/83947140954.pdfIn PDF document text
    • http://legalugo.pbworks.com/f/10790752979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b8e5227-4231-4d80-8107-4099109f0d35/the_secret_check_sample.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002151f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2151F 5588 bytes
SHA-256: 4649a45943359bbb95369468a95dcf2ee20810c31a5d6cef036ccaa30a66b67c
font_01_sfnt_off0002280d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2280D 10832 bytes
SHA-256: a7406ba82e4726cb738341d179e7b8bab9e4f34e7023c2757eab598277a1fb42

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